Air-pump.



J. H. CHAMP.

AIR PUMP.

APPLICATION FILED NOV.21.1908.

Patented July 22, 1913.

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7%2/72566 n9 B fuzz/$30:

J. H. CHAMP.

AIR PUMP.

APPLICATION IILBD NOV.21. 1908. 1,068,218. Patented July 22, 1913.

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JOSEPH H. CHAMP, 01 CLEVELAND, OHIO.

A IR-PUMP.

specification of Letters iPatent.

inseam.

Application filed November 21, 1908.

To all whom it may concern lie it known that ll, il osnrrr H. CHAMP, a citizen of the United States, and a resident of Cleveland, county of Uuyahoga, and State of Ohio, have invented a new and useful Tn'iprovement in Air-Pumps, of which the following is a specification, the principle of the invention being herein explained and. the bestincde in which T have contemplated applying that nrinciplc, so to distinguish it from other inventions.

The subject matter of the present invention eon'iprehends certain detail improvements in pumps of the type employed in compressing air, carbonic acid. gas and the like, such improvements relating more particularly to the lubrication of the crank shaft of the pump, to the lubrication of the bearing surfaces of the piston and cylinder, and to the provision of a safety escape valve to prevent the accumulation of an excessive pressure in the receptacle to which the air or the fluid is being supplied by the pump. Said invention, then consists of the means hereinafter fully described and particularly pointed out in the claim.

The annexed drawings and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings: Figure l is a front elevational View, with a part shown in section, of a pump embodying my several improvements, Fig. 9. is a side elevation of such pump, with a part again shown in section; Fig. 3 is a section of yet another detail of the pump and on a larger scale, the plane of the section being the same as that of the part section in Fig. 2 and Fig. t illustrates a modification in the constructitm of the connections to the pump cylinder.

The general arrangement of the pumping mechanism may be briefly set forth. The crank shaft B, from which the several parts of the pumping mechanism, proper, are operated, is transversely journaled in a suitable support A rising from a base A, upon an integral portion of which is secured the electric motor (1, that in the present instance forms the driving agent for the pump, the pinion 0 of such motor meshing with a large gear Z) mounted upon one end of said crank shaft. The support A for the crank shaft is provided with spaced Patented July 22, 1913.

Serial No. 483,740.

bearings a therefor, and has formed between such bearings a chamber (L2 for lubricant that encircles the shaft; by packing this chamber with suitable material and maintaining a supply of luluicant in the cup a that communicates therewith, anv danger of the bearings becoming heated is eliminated, and once the chamber itself .is filled a further addition of lubricant can be deferred indefinitely, thus particularly adapting the machine for the unskilled and careless use, to which pumps of this kind are frequently subjected.

The pumping mechanism, proper, comprises the vertical, cylinders B disposed adjacent to the respective ends of such crank shaft, within which reciprocate pistons a operatively connected with the crank shaft by connecting rods Q5 of the usual construction. Cylinders B are fixed to the same base A, from which the crank shaft support A rises, and their upper ends are hence open to permit free play of connecting rods 6 The pistons comprise cup-like members to which the lower ends of the connecting rods are pivotally secured, and washers b, forming a packing member, secured to the lower end of the said cup like members. Each of the latter is provided with an encircling groove 6" near its lower end that has comnnmication by an aperture D with said members interior, so that by maintaining a suitable supply of lubricant within the latter, assurance that the bearing surfaces of piston and cylinders are properly lubricated is at all times had.

The air or other fluid being handled by the pump is designed in the case of the specific structure illustrated, to be admit ted to the cylinders through suitable casings B B laterally connected therewith. and joined by a tube or duct 5" so as to permit of the use of a single discharge or outlet connection 6 Where it is desired to draw the fluid from some particular source, the inlet connections of the respective casings may be joined by a transverse pipe 73* as illustrated in Fig. l. The two casings B 13 referred to as being thus connected with the pump cylinder, are substantially alike, so that a description of the one l5 only need be given, although the one that is described comprises certain additional features, constitutin the escape valve, that are not included in the other. Referring then to Figs. 2 and 3, such casing will be seen to comprise three alined tubular members disposed one above the other, the second member being threaded into the first, and the third into the second. These members provide two chambers 6 6, the lower 5 of which is directly connected with the corresponding pump cylinder B, by an opening 5 and has an inlet opening 6 while the other chamber 6 has two outlet openings 6 6. Suitable valves 1) 5 respectively control the inlet opening into the first chamber, so as to freely admit air into said chamber and the opening between the first and the second chamber, so as to permit free egress of such air into the latter. The first of said members, the chamber in which is thus laterally connected with the pump cylinder, has an annular, upwardly directed valve seat above such connection wherewith cooperates the valve 0 said valve being held between such valve seat and the second of said members, but being freely removable upon unthreading the latter from the first member. Of the two outlet openings wherewith the second chamber is provided, the one 5 in connection with the receptacle to be supplied by the pump is unobstructed, while the other 6 has a valve 6 controlling the escape of the air therethrough, a compression spring Z), the tension of which may be adjusted by rotation of nut Z), serving to retain the same on its seat, except upon a pre determined pressure being exerted from within. The operation of such escape valve should be fairly obvious from the preceding description of its construction, the efl'ect being to permit the building up of a pres sure by the pump to a pre-determined maximum, whereupon, without the operation of the pump being in anywise affected, any excess of pressure will be automatically relieved. This control is secured without any undue complexity of parts such as might render the device unduly expensive, and what is more important, liable to get out of order. At the same time the other features, relating particularly to lubrication of the several operative parts of the pump, will be seen to enhance considerably the practical character of the machine.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by the following claim or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention In a pump, the combination with the pump cylinder and the piston reciprocable therein; of a casing separate from said cyl inder, said casing comprising four alined tubular members disposed one above the other, the first and third members being threaded into the second, and the fourth into the third, the second of said members having a tubular projection threaded into and opening into said cylinder, and having an inlet opening below and an upwardly directed valve seat above the opening into the cylinder, and a free lateral discharge opening above the valve seat; a freely upwardly opening valve controlling the inlet opening; a freely upwardly opening valve on said valve seat; an opening from above said valve seat into the fourth member, said member having a vent; an upwardly opening valve controlling the opening into the fourth member; a spring normally holding the last-named valve on its seat; and a member threaded in the top of the fourth member and adapted to vary the tension of said spring.

Signed by me this 16th day of November,

JOSEPH H. CHAMP. Attested by CHRISTINE E. Aims, JNo. F. OBERLIN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

